<p></p>
<p><b>@benpicco</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/16739#discussion_r714968833">examples/sock_tcp_echo/Makefile</a>:</p>
<pre style='color:#555'>> +USEMODULE += netdev_default
+
+USEMODULE += shell
+USEMODULE += shell_commands
+USEMODULE += ps
+USEMODULE += netutils
+
+ifeq (1, $(LWIP))
+  USEMODULE += ipv6_addr
+  USEMODULE += lwip_ipv6_autoconfig
+  USEMODULE += lwip_netdev
+else
+  USEMODULE += auto_init_gnrc_netif
+  USEMODULE += gnrc_ipv6_default
+  # we want to be able to open two sockets
+  CFLAGS += -DCONFIG_GNRC_TCP_RCV_BUFFERS=2
</pre>
<blockquote>
<p>I think you also need to activate the module config <code>CONFIG_KCONFIG_USEMODULE_GNRC_TCP=y</code>, but Kconfig will complain if something goes wrong (that's the advantage of Kconfig instead of just using CFLAGS ;-))</p>
</blockquote>
<p>I mean to actually make the build system use the app.config file. It just being present doesn't make the build system pick it up.</p>

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